Colin Dexter: Last Seen Wearing
From the Publisher:
Valerie Taylor has been missing since she was a sexy seventeen, more than two years ago. Inspector Morse is sure she's dead. But if she is, who forged the letter to her parents saying "I am alright so don't worry"? Never has a woman provided Morse with such a challenge, for each time the pieces of the jigsaw start falling into place, someone scatters them again. So Valerie remains as tantalizingly elusive as ever. Morse prefers a body - a body dead from unnatural causes. And very soon he gets one...
Colin Dexter: Last Seen Wearing. Ivy Books, ISBN: 0804114919 (April, 1997), $6.99.